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Nitrogen Vertical Distribution Differed in Foliar and Nonfoliar Organs of Dryland Wheat during Grain Filling
Author(s) -
Chen Wei,
Wang Linlin,
Siddique Kadambot H.M.,
Deng Xiping,
Chen Yinglong
Publication year - 2019
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2018.04.0243
Subject(s) - canopy , anthesis , nitrogen , agronomy , biology , field experiment , plant stem , mulch , chemistry , botany , cultivar , organic chemistry
Core Ideas There was a positive correlation between nitrogen concentration in grain and between Layer 1 and Layer 4 (Gtotal). The nonfoliar organs were involved in to determine the nitrogen vertical distribution in winter wheat canopy. The nitrogen contributions of various organs to grain nitrogen were determined.ABSTRACT The role of N remobilization in nonfoliar and foliar organs influences the N vertical distribution and accumulation of N in grain. We hypothesized that the N concentrations in foliar and nonfoliar organs affect the remobilization, vertical distribution, and accumulation on N in grain. A 2‐yr field experiment was conducted to evaluate the effects of N input and mulching practice on N remobilization and N vertical distribution in the canopy of winter wheat ( Triticum aestivum L.). The results showed that foliar organs had higher N concentration than nonfoliar organs in all treatments. Among the nonfoliar organs, the flag leaf sheath had the highest N concentration, followed by glumes and rachillae combination, while the stem had the lowest N concentration at anthesis and maturity. In the different internode segments of the stem, N concentrations decreased with grain filling, except for the exposed part of the peduncle. There was a top‐to‐down decline in N concentration within the canopy. Foliar organs contributed the most N to grain followed by the stem and the glumes and rachillae combination. The N286 treatment significantly improved N accumulation, remobilization, and vertical distribution in the canopy and N content in grain. Nitrogen concentration in the grain was positively correlated with the difference in N concentrations between apical and basal vegetative modules.